[PATCH] bcache: Convert to use sysfs_emit()/sysfs_emit_at() APIs

[PATCH] bcache: Convert to use sysfs_emit()/sysfs_emit_at() APIs

[ye.xingchen]

From: ye xingchen <ye.xingchen@zte.com.cn>

Follow the advice of the Documentation/filesystems/sysfs.rst and show()
should only use sysfs_emit() or sysfs_emit_at() when formatting the
value to be returned to user space.

Signed-off-by: ye xingchen <ye.xingchen@zte.com.cn>
---
 drivers/md/bcache/sysfs.c | 31 +++++++++++++++----------------
 1 file changed, 15 insertions(+), 16 deletions(-)

diff --git a/drivers/md/bcache/sysfs.c b/drivers/md/bcache/sysfs.c
index c6f677059214..0e2c1880f60b 100644
--- a/drivers/md/bcache/sysfs.c
+++ b/drivers/md/bcache/sysfs.c
@@ -1111,26 +1111,25 @@ SHOW(__bch_cache)

 		vfree(p);

-		ret = scnprintf(buf, PAGE_SIZE,
-				"Unused:		%zu%%\n"
-				"Clean:		%zu%%\n"
-				"Dirty:		%zu%%\n"
-				"Metadata:	%zu%%\n"
-				"Average:	%llu\n"
-				"Sectors per Q:	%zu\n"
-				"Quantiles:	[",
-				unused * 100 / (size_t) ca->sb.nbuckets,
-				available * 100 / (size_t) ca->sb.nbuckets,
-				dirty * 100 / (size_t) ca->sb.nbuckets,
-				meta * 100 / (size_t) ca->sb.nbuckets, sum,
-				n * ca->sb.bucket_size / (ARRAY_SIZE(q) + 1));
+		ret = sysfs_emit(buf,
+				 "Unused:		%zu%%\n"
+				 "Clean:		%zu%%\n"
+				 "Dirty:		%zu%%\n"
+				 "Metadata:	%zu%%\n"
+				 "Average:	%llu\n"
+				 "Sectors per Q:	%zu\n"
+				 "Quantiles:	[",
+				 unused * 100 / (size_t) ca->sb.nbuckets,
+				 available * 100 / (size_t) ca->sb.nbuckets,
+				 dirty * 100 / (size_t) ca->sb.nbuckets,
+				 meta * 100 / (size_t) ca->sb.nbuckets, sum,
+				 n * ca->sb.bucket_size / (ARRAY_SIZE(q) + 1));

 		for (i = 0; i < ARRAY_SIZE(q); i++)
-			ret += scnprintf(buf + ret, PAGE_SIZE - ret,
-					 "%u ", q[i]);
+			ret += sysfs_emit_at(buf, ret, "%u ", q[i]);
 		ret--;

-		ret += scnprintf(buf + ret, PAGE_SIZE - ret, "]\n");
+		ret += sysfs_emit_at(buf, ret, "]\n");

 		return ret;
 	}
-- 
2.25.1

Re: [PATCH] bcache: Convert to use sysfs_emit()/sysfs_emit_at() APIs

[Coly Li]

> 2022年12月7日 17:02，<ye.xingchen@zte.com.cn> <ye.xingchen@zte.com.cn> 写道：
> 
> From: ye xingchen <ye.xingchen@zte.com.cn>
> 
> Follow the advice of the Documentation/filesystems/sysfs.rst and show()
> should only use sysfs_emit() or sysfs_emit_at() when formatting the
> value to be returned to user space.
> 
> Signed-off-by: ye xingchen <ye.xingchen@zte.com.cn>

Added to my for-next queue for Linux v6.3 merge window.

Thanks.

Coly Li


> ---
> drivers/md/bcache/sysfs.c | 31 +++++++++++++++----------------
> 1 file changed, 15 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/md/bcache/sysfs.c b/drivers/md/bcache/sysfs.c
> index c6f677059214..0e2c1880f60b 100644
> --- a/drivers/md/bcache/sysfs.c
> +++ b/drivers/md/bcache/sysfs.c
> @@ -1111,26 +1111,25 @@ SHOW(__bch_cache)
> 
> vfree(p);
> 
> - ret = scnprintf(buf, PAGE_SIZE,
> - "Unused: %zu%%\n"
> - "Clean: %zu%%\n"
> - "Dirty: %zu%%\n"
> - "Metadata: %zu%%\n"
> - "Average: %llu\n"
> - "Sectors per Q: %zu\n"
> - "Quantiles: [",
> - unused * 100 / (size_t) ca->sb.nbuckets,
> - available * 100 / (size_t) ca->sb.nbuckets,
> - dirty * 100 / (size_t) ca->sb.nbuckets,
> - meta * 100 / (size_t) ca->sb.nbuckets, sum,
> - n * ca->sb.bucket_size / (ARRAY_SIZE(q) + 1));
> + ret = sysfs_emit(buf,
> + "Unused: %zu%%\n"
> + "Clean: %zu%%\n"
> + "Dirty: %zu%%\n"
> + "Metadata: %zu%%\n"
> + "Average: %llu\n"
> + "Sectors per Q: %zu\n"
> + "Quantiles: [",
> + unused * 100 / (size_t) ca->sb.nbuckets,
> + available * 100 / (size_t) ca->sb.nbuckets,
> + dirty * 100 / (size_t) ca->sb.nbuckets,
> + meta * 100 / (size_t) ca->sb.nbuckets, sum,
> + n * ca->sb.bucket_size / (ARRAY_SIZE(q) + 1));
> 
> for (i = 0; i < ARRAY_SIZE(q); i++)
> - ret += scnprintf(buf + ret, PAGE_SIZE - ret,
> - "%u ", q[i]);
> + ret += sysfs_emit_at(buf, ret, "%u ", q[i]);
> ret--;
> 
> - ret += scnprintf(buf + ret, PAGE_SIZE - ret, "]\n");
> + ret += sysfs_emit_at(buf, ret, "]\n");
> 
> return ret;
> }
> -- 
> 2.25.1